5 Common Causes of Upper GI Bleeding: When to Worry and When to See a Doctor

5 Common Causes of Upper GI Bleeding: When to Worry and When to See a Doctor

Upper Gastrointestinal (UGI) bleeding originates in the oesophagus, stomach, or the first part of the small intestine (duodenum).

Whilst it can be alarming, vomiting blood (the cardinal sign)—whether bright red or dark like coffee grounds—serves as a roadmap for doctors to find the source.

Early intervention is vital, as upper GI issues can range from mild irritation to life-threatening emergencies. Here are the five most common culprits.

1. Peptic Ulcers

Peptic ulcers are open sores that develop on the inside lining of your stomach and the upper portion of your small intestine. They are the most common cause of UGI bleeding.

• The Cause: Most ulcers are caused by a bacterial infection ($H. pylori$) or long-term use of nonsteroidal anti-inflammatory drugs (NSAIDs) like Ibuprofen or Naproxen.

• The Sign: You may experience “coffee-ground” vomit or black, tarry stools. This is often accompanied by a gnawing or burning pain in the upper abdomen.

2. Oesophageal Varices

These are enlarged, swollen veins in the lining of the lower esophagus. They occur most frequently in people with serious liver disease (cirrhosis).

• The Cause: When blood flow to the liver is blocked, pressure builds up in the veins of the esophagus. If the pressure becomes too high, the veins can rupture.

• The Sign: This often results in painless but massive bright red vomiting. This is a medical emergency due to the high volume of blood loss.

3. Mallory-Weiss Tears

A Mallory-Weiss tear is a physical laceration in the mucous membrane where the esophagus meets the stomach.

• The Cause: These tears are typically caused by severe or prolonged vomiting, violent coughing, or retching (often seen after heavy alcohol consumption).

• The Sign: Bright red blood in the vomit, usually appearing after several episodes of non-bloody vomiting.

4. Gastritis and Oesophagitis

These conditions involve general inflammation of the lining of the stomach (gastritis) or the oesophagus (oesophagitis).

• The Cause: Chronic Acid Reflux (GORD) is the main driver of oesophagitis, while gastritis is often triggered by alcohol, smoking, or stress.

• The Sign: The bleeding is usually slow and “oozing” rather than a sudden gush. It may lead to dark stools or be discovered only through a blood test showing anemia.

5. Upper GI Cancers

Tumors in the esophagus or stomach can weaken the lining and cause chronic bleeding as they grow.

• The Cause: Malignant growths that erode the blood vessels within the digestive wall.

• The Sign: Persistent, low-grade bleeding that may cause dark stools.

• Warning Signs: Difficulty swallowing (dysphagia), feeling full after eating very little, and unintentional weight loss.

The Appearance of Blood: A Quick Guide

In Upper GI bleeding, the color tells the story of how long the blood has been in contact with stomach acid.

When to Worry: The Emergency “Red Flags”

Upper GI bleeding can become critical very quickly. Seek emergency care immediately if you experience:

• Vomiting large amounts of bright red blood.

• Feeling lightheaded or fainting (signs of significant blood loss/low blood pressure).

• Shortness of breath or a racing heart.

• Severe, “tearing” pain in the chest or upper abdomen.

When to See a Doctor (Non-Emergency)

Schedule an appointment with a GP or Gastroenterologist if you notice:

• Stools that are consistently darker or more “sticky” than usual.

• Persistent indigestion or heartburn that doesn’t respond to antacids.

• Anaemia symptoms: Chronic fatigue, pale skin, and weakness.

• A history of $H. pylori$ infection or heavy NSAID use.

Next Steps in Diagnosis

The “gold standard” for diagnosing Upper GI bleeding is a Gastroscopy (Endoscopy). A doctor uses a thin, flexible camera to look directly at the lining of the esophagus and stomach.

This tool is unique because it allows the doctor to both find the bleed and stop it (using clips or heat) during the same procedure.